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Gasoline fell almost 21 cents in the past two weeks to $3.55 a gallon, according to the latest Lundberg survey of filling stations released Sunday, while oil held near a four-month low in the wake of Hurricane Sandy.

CINCINNATI — A Volvo Trucks executive described natural gas as a significant “windfall” for the United States, and a manufacturer of natural gas fuel systems said truck buyers must parse a host of fine details before purchasing a vehicle.

CINCINNATI — Truck and engine makers said that meeting the federal government’s greenhouse-gas standards that take effect in 2017 while still complying with the 2010 emissions rule is a difficult challenge and could result in more “hard programming” of engine settings and fewer choices for fleets in their tractors.

U.S. average diesel prices dropped 8.6 cents last week, the largest decrease in almost four years, to $4.03 a gallon, the Department of Energy reported. Meanwhile, analysts said they were not expecting any lasting increases in prices as a result of Hurricane Sandy.

The U.S. Environmental Protection Agency Wednesday temporarily waive federal clean diesel fuel requirements in New Jersey to allow the use of home heating oil in most generators and pumps in emergency service in New Jersey.

American Trucking Associations said its “Natural Gas in Trucking” summit meeting has sold out, and there is a waiting list of 20% beyond capacity for the Nov. 28-30 event in Arlington, Va.

U.S. retail diesel prices declined 3.4 cents to $4.116 a gallon last week, dipping after reaching the highest levels in more than four years a week earlier, the Department of Energy reported.